[ncl-talk] Fwd: Problem with regrid from GFS to WRF regional grid using rgrid2rcm

[Andrew Kren - NOAA Affiliate]

Thanks Dennis. Yes I just found that out, and reversed the order and it
worked. Thanks!

On Thu, Aug 27, 2015 at 3:00 PM, Dennis Shea <shea at ucar.edu> wrote:

> Hi Andrew
>
> [0]
> Overall comment: the rgrid2rcm uses a simple, brute force algorithm.
> If the interpolation is a bit slow then the ESMF regridding may be a
> better lon term solution. Once thye weight files are generated and
> saved to a netCDF file, they can be used to quickly perform
> interpolations.
>
> [1]
> Most operational style models (NCEP, ECMWF, JRA) are ordered N->S. The
>  rgrid2rcm requires that the input grid be ordered S->N. If the model
> grid is N->S, try
>
>    slp1     = a->PRMSL_3_MSL
>    printVarSummary(slp1)                     ; look at 'lat' coord variable
>    slp1     = slp1(::-1,:)                           ; reorder
>    printVarSummary(slp1)                     ; look at 'lat' coord variable
>
>    all the rest should be the same
>
> [2]
> ftp the GRIB file and the target WRF file, we could likely generate an
> ESMF example.
>
> ftp ftp.cgd.ucar.edu
> anonymous
> email
> cd incoming
> put ...
> put ...
> quit
>
> Since we can not look at /ftp/incoming for security reasons, send us
> the exact names of the files after a successful transfer
>
> D
>
>
>
>
> On Thu, Aug 27, 2015 at 11:22 AM, Andrew Kren - NOAA Affiliate
> <andrew.kren at noaa.gov> wrote:
> >
> > ---------- Forwarded message ----------
> > From: Andrew Kren - NOAA Affiliate <andrew.kren at noaa.gov>
> > Date: Thu, Aug 27, 2015 at 8:57 AM
> > Subject: Problem with regrid from GFS to WRF regional grid using
> rgrid2rcm
> > To: ncl-talk at ucar.edu
> >
> >
> > Dear NCL talk,
> >
> > I am running into an issue with regridding from the GFS global grid,
> which
> > are grib files, to the regional WRF grid that I specify for my WRF runs.
> > When I do a test script to see what the regridded dataset looks like, it
> > does not match up with the GFS fields. Right now I am just looking at
> MSLP.
> > I am using the ncl function rgrid2rcm. Is this not the correct regrid
> tool
> > for my applications? I am not sure what I am doing wrong, if anything.
> There
> > are no error messages when I run the script. I have uploaded a grib file
> and
> > the wrfout file to the ftp site. The postscript files of the WRF output
> > (correct grid) and my interpolated grid from GFS to WRF is attached,
> along
> > with a script I am using. Any help would be most appreciated.
> >
> > Thanks,
> > --
> > Andrew Kren, PhD
> > Research Scientist I, Global Observing Systems Analysis (GOSA) Group
> > NOAA ESRL Global Systems Division (Rm 3C515)
> > 325 Broadway, Boulder, CO 80305
> > (303) 497-5418
> >
> >
> >
> > --
> > Andrew Kren, PhD
> > Research Scientist I, Global Observing Systems Analysis (GOSA) Group
> > NOAA ESRL Global Systems Division (Rm 3C515)
> > 325 Broadway, Boulder, CO 80305
> > (303) 497-5418
> >
> > _______________________________________________
> > ncl-talk mailing list
> > ncl-talk at ucar.edu
> > List instructions, subscriber options, unsubscribe:
> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
> >
>



-- 
Andrew Kren
Research Scientist I, Global Observing Systems Analysis (GOSA) Group
NOAA ESRL Global Systems Division (Rm 3C515)
325 Broadway, Boulder, CO 80305
(303) 497-5418
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